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Journal Article

h/e oscillations in interlayer transport of delafossites


Oka,  Takashi
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;


Moessner,  Roderich
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Putzke, C., Bachmann, M. D., McGuinness, P., Zhakina, E., Sunko, V., Konczykowski, M., et al. (2020). h/e oscillations in interlayer transport of delafossites. Science, 368(6496), 1234-1238. doi:10.1126/science.aay8413.

Cite as: https://hdl.handle.net/21.11116/0000-0007-4360-1
Microstructures can be carefully designed to reveal the quantum phase of the wave-like nature of electrons in a metal. Here, we report phase-coherent oscillations of out-of-plane magnetoresistance in the layered delafossites PdCoO2 and PtCoO2. The oscillation period is equivalent to that determined by the magnetic flux quantum, h/e, threading an area defined by the atomic interlayer separation and the sample width, where h is Planck's constant and e is the charge of an electron. The phase of the electron wave function appears robust over length scales exceeding 10 micrometers and persisting up to temperatures of T > 50 kelvin. We show that the experimental signal stems from a periodic field modulation of the out-of-plane hopping. These results demonstrate extraordinary single-particle quantum coherence lengths in delafossites.